To find the missing part, we can examine the equations given:
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The first equation is: \[ 3 + ___ = 8 \] To solve for the missing part: \[ ___ = 8 - 3 = 5 \]
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The second equation is: \[ 8 - 3 = ___ \] Which we already calculated, so: \[ ___ = 5 \]
Thus, the missing number is 5.